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A jigsaw puzzle piece fits into place in a jigsaw puzzle through its unique shape. Each piece has a specific contoured edge that is designed to interlock with the edges of the surrounding pieces. The shape of the piece, with its tabs, grooves, and curves, allows it to only fit correctly in one specific location within the puzzle.
When a piece is placed in the right spot, the edges will seamlessly connect with the neighboring pieces, creating a tight, interlocking fit. This is what allows the individual puzzle pieces to come together to form the complete puzzle image. The contours and shape of each piece are carefully engineered to ensure a precise fit that holds the puzzle together as it is assembled.